---
title: kHFSPlusExtentKeyMaximumLength
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1646121-anonymous/khfsplusextentkeymaximumlength
---

# kHFSPlusExtentKeyMaximumLength

## Declaration

```occ
kHFSPlusExtentKeyMaximumLength = sizeof(HFSPlusExtentKey) - sizeof(u_int16_t)
```